This patch adds DMA_CYCLIC capability that is used for audio driver.
DMA driver with DMA_CYCLIC capability reuses the dma requests that
were submitted through tx_submit().
Signed-off-by: Boojin Kim <boojin.kim@xxxxxxxxxxx>
---
drivers/dma/pl330.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 111 insertions(+), 0 deletions(-)
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 880f010..121c75a 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -69,6 +69,11 @@ struct dma_pl330_chan {
* NULL if the channel is available to be acquired.
*/
void *pl330_chid;
+
+ /* taks for cyclic capability */
+ struct tasklet_struct *cyclic_task;
+
+ bool cyclic;
};
struct dma_pl330_dmac {
@@ -184,6 +189,41 @@ static inline void fill_queue(struct dma_pl330_chan *pch)
}
}
+static void pl330_tasklet_cyclic(unsigned long data)
+{
+ struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
+ struct dma_pl330_desc *desc, *_dt;
+ unsigned long flags;
+ LIST_HEAD(list);
+
+ spin_lock_irqsave(&pch->lock, flags);
+
+ /* Pick up ripe tomatoes */
+ list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
+ if (desc->status == DONE) {
+ dma_async_tx_callback callback;
+
+ list_move_tail(&desc->node, &pch->work_list);
+ pch->completed = desc->txd.cookie;
+
+ desc->status = PREP;
+
+ /* Try to submit a req imm.
+ next to the last completed cookie */
+ fill_queue(pch);
+
+ /* Make sure the PL330 Channel thread is active */
+ pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START);
+
+ callback = desc->txd.callback;
+ if (callback)
+ callback(desc->txd.callback_param);
+
+ }
+
+ spin_unlock_irqrestore(&pch->lock, flags);
+}
+
static void pl330_tasklet(unsigned long data)
{
struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
@@ -227,6 +267,9 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
spin_unlock_irqrestore(&pch->lock, flags);
+ if (pch->cyclic_task)
+ tasklet_schedule(pch->cyclic_task);
+ else
tasklet_schedule(&pch->task);
}
@@ -316,6 +359,15 @@ static void pl330_free_chan_resources(struct dma_chan *chan)
pl330_release_channel(pch->pl330_chid);
pch->pl330_chid = NULL;
+ if (pch->cyclic) {
+ pch->cyclic = false;
+ list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool);
+ if (pch->cyclic_task) {
+ tasklet_kill(pch->cyclic_task);
+ pch->cyclic_task = NULL;
+ }
+ }
+
spin_unlock_irqrestore(&pch->lock, flags);
}
@@ -547,6 +599,63 @@ static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
return burst_len;
}
+static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
+ struct dma_chan *chan, dma_addr_t dma_addr, size_t len,
+ size_t period_len, enum dma_data_direction direction)
+{
+ struct dma_pl330_desc *desc;
+ struct dma_pl330_chan *pch = to_pchan(chan);
+ struct dma_pl330_peri *peri = chan->private;
+ dma_addr_t dst;
+ dma_addr_t src;
+
+ pch = to_pchan(chan);
+ if (!pch)
+ return NULL;
+
+ desc = pl330_get_desc(pch);
+ if (!desc) {
+ dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+
+ switch (direction) {
+ case DMA_TO_DEVICE:
+ desc->rqcfg.src_inc = 1;
+ desc->rqcfg.dst_inc = 0;
+ src = dma_addr;
+ dst = peri->fifo_addr;
+ break;
+ case DMA_FROM_DEVICE:
+ desc->rqcfg.src_inc = 0;
+ desc->rqcfg.dst_inc = 1;
+ src = peri->fifo_addr;
+ dst = dma_addr;
+ break;
+ default:
+ dev_err(pch->dmac->pif.dev, "%s:%d Invalid dma direction\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+
+ desc->rqcfg.brst_size = peri->burst_sz;
+ desc->rqcfg.brst_len = 1;
+
+ if (!pch->cyclic_task) {
+ pch->cyclic_task =
+ kmalloc(sizeof(struct tasklet_struct), GFP_KERNEL);
+ tasklet_init(pch->cyclic_task,
+ pl330_tasklet_cyclic, (unsigned int)pch);
+ }
+
+ pch->cyclic = true;
+
+ fill_px(&desc->px, dst, src, period_len);
+
+ return &desc->txd;
+}
+
static struct dma_async_tx_descriptor *
pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
dma_addr_t src, size_t len, unsigned long flags)
@@ -780,6 +889,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
case MEMTODEV:
case DEVTOMEM:
dma_cap_set(DMA_SLAVE, pd->cap_mask);
+ dma_cap_set(DMA_CYCLIC, pd->cap_mask);
break;
default:
dev_err(&adev->dev, "DEVTODEV Not Supported\n");
@@ -805,6 +915,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
pd->device_free_chan_resources = pl330_free_chan_resources;
pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
+ pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic;
pd->device_tx_status = pl330_tx_status;
pd->device_prep_slave_sg = pl330_prep_slave_sg;
pd->device_control = pl330_control;
--
1.7.1
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